Galaxy clustering, CMB and supernova data constraints on ϕCDM model
with massive neutrinos
release_yujofwpxlvfk3cj3fae4772zvi
by
Yun Chen,
Lixin Xu
2015
Abstract
We investigate a scalar field dark energy model (i.e., ϕCDM model) with
massive neutrinos, where the scalar field possesses an inverse power-law
potential, i.e., V(ϕ)∝ϕ^-α (α>0). We find that
the sum of neutrino masses Σ m_ν has significant impacts on the CMB
temperature power spectrum and on the matter power spectrum. In addition, the
parameter α also has slight impacts on the spectra. A joint sample,
including CMB data from Planck 2013 and WMAP9, galaxy clustering data from
WiggleZ and BOSS DR11, and JLA compilation of Type Ia supernova observations,
is adopted to confine the parameters. Within the context of the ϕCDM model
under consideration, the joint sample determines the cosmological parameters to
high precision. It turns out that α <4.995 at 95
model. And yet, the ΛCDM scenario corresponding to α = 0 is not
ruled out at 95
the ϕCDM model, while the corresponding one for the ΛCDM model is
Σ m_ν < 0.293 eV. The allowed scale of Σ m_ν in the
ϕCDM model is a bit smaller than that in the ΛCDM model. It is
consistent with the qualitative analysis, which reveals that the increases of
α and Σ m_ν both can result in the suppression of the matter
power spectrum. As a consequence, when α is larger, in order to avoid
suppressing the matter power spectrum too much, the value of Σ m_ν
should be smaller.
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